Gold prices extended gains for the fourth straight session, rising 20 rupees, to 19,145 rupees per ten grams at Delhi's bullion market, today. Silver ready rose 50 rupees, to 30,150 rupees per kilo.In the international market, gold rose to a new record high of 1,263.90 dollars an ounce, as investors bought the precious metal to protect their wealth from uncertainty in global economic growth.